3 : Motion Flashcards
1
Q
average speed
A
- s= d/t
- rate in change of distance
2
Q
velocity
A
- SUVAT
- v = x/t
- rate of change in displacement
3
Q
acceleration
A
- SUVAT
- a = ∆v (v-u) / t
- rate of change in velocity
4
Q
displacement
A
- how far an objects travelled from its starting point in a given direction
5
Q
thinking distance
A
- the distance travelled between the moment when you first see a reason to stop and the moment the brakes are applied
- speed x reaction time
6
Q
braking distance
A
- distance travelled from the time the brake is applied until the vehicle stops
7
Q
stopping distance
A
- braking + thinking
8
Q
acceleration due to gravity
A
- objects with mass exert a gravitational force on each other
- objects released on earth will accelerate vertically downwards
- with no other force on it = free fall
- g = 9.81ms^ -2
9
Q
projectile motion
A
vertical and horizontal motion are independent of each other
(assume no air resistance)
10
Q
vertical motion
A
- changes due to acceleration of free fall
- vertical displacement and time f slight can be calculated using SUVAT
11
Q
horizantal motion
A
remains constant
12
Q
horizontal acceleration
A
gcos90 = 0
